Retailers across the United States are gearing up for Black Friday and Cyber Monday, two of the biggest shopping days on the calendar, according to BlackFriday.fm. While Black Friday and Cyber Monday were typically each day-long shopping sprees, many retailers are now offeringdiscounts that last for days and sometimes weeks. This year, the shopping extravaganzas fall on Friday, Nov. 27 and Monday, Nov. 30.

Shoppers in the market for iPhones and iPhone accessories will have a number of options to choose from on Black Friday and Cyber Monday. Here's a roundup of what some of the major retailers in the U.S. will offer shoppers in the iPhone department this year, including deals on the new iPhone 6s and iPhone 6s Plus.

Black Friday

According to the Verge, on Black Friday Target will offer shoppers the iPhone 6s with 16GB of memory for $149.99, a $50 discount. Those buyers are required to sign a two-year contract with either Verizon or Sprint.

At Target, shoppers can get the iPhone 6s Plus with 16GB of memory for $249.99, also a $50 discount, in addition to the two-year contract.

Meanwhile, at Wal-Mart, buyers will be offered $200 off iPhone purchases if he or she buys the device via AT&T Next or Verizon Device Payment, the International Business Times reported. Wal-Mart will even throw in a $100 gift card to sweeten the deal.

Cyber Monday

According to Tech Times, Best Buy is offering shoppers a trade off during Cyber Monday. By trading in an iPhone 5, or any model after the iPhone 5, Best Buy will give shoppers a $200 gift card.

Mobile carriers are also offering customers Cyber Monday discounts. Beginning at 5:01 a.m. Eastern on Cyber monday, T-Mobile will be offering free memory upgrades to all shoppers in the market for iPhones.

Here's T-Mobile's best offer: Consumers who purchase a 16GB iPhone 6s or iPhone 6s Plus will get an upgrade to the same model with 64GB of memory. Those who buy the iPhone 6s or iPhone 6s Plus can get upgraded for free to 64GB.

"Additional memory means more space for the epic photos and videos shot on your iPhone," the company said in a press release. "It means enjoying more music and more of the 1.5 million amazing apps available on the App Store while still having plenty of room to grow your content libraries as your storage needs grow over time."

"But shoppers hoping to tap into T-Mobile's discounts would be well advised to act fast," T-Mobile added in its press release.